Method of initializing a pluggable electrical unit

A method of initializing a pluggable electrical unit in a modular system, said system comprising a base unit, at least one pluggable electrical unit, each pluggable electrical unit having module electronics and a read-only memory with identifiers that clearly identify said unit and an interface between the base unit and the pluggable electrical unit, said interface equipped with

• a variable resistor arranged in a feed line,
• first switching means, through which the read-only memory is disconnected from the base unit, and
• second switching means, through which the module electronics are disconnected from the base unit,
• said method comprising:
• bringing the variable resistor into its low-resistance state in a controlled manner after the elapse of a first waiting time, which begins with the insertion of the pluggable electrical unit in said system,
• switching the first switching means to conduct and connect the read-only memory to the base unit after the elapse of a second waiting time, beginning with the end of the first waiting time,
• testing on the basis of the identifying identifiers, the compatibility of the pluggable electrical unit with the base unit,
• switching the second switching means to conduct and connect the module electronics to the base unit when said pluggable unit is compatible with said base unit, and
• when said pluggable unit is not compatible with said base unit, isolating the read-only memory from the base unit by switching said first switching means to not conduct and bringing the variable resistor in a controlled manner into its high-resistance state.

A method of initializing a pluggable electrical unit in a modular system, said system comprising a base unit, at least one pluggable electrical unit, each pluggable electrical unit having module electronics and a read-only memory with identifiers that clearly identify said unit and an interface between the base unit and the pluggable electrical unit, said interface equipped with

• a variable resistor arranged in a feed line,
• first switching means, through which the read-only memory is disconnected from the base unit, and
• second switching means, through which the module electronics are disconnected from the base unit,
• said method comprising:
• bringing the variable resistor into its low-resistance state in a controlled manner after the elapse of a first waiting time, which begins with the insertion of the pluggable electrical unit in said system,
• switching the first switching means to conduct and connect the read-only memory to the base unit after the elapse of a second waiting time, beginning with the end of the first waiting time,
• testing on the basis of the identifying identifiers, the compatibility of the pluggable electrical unit with the base unit,
• switching the second switching means to conduct and connect the module electronics to the base unit when said pluggable unit is compatible with said base unit, and
• switching the second switching means to not conduct and disconnect the module electronics from the base unit when said pluggable unit is faulty.